With the recent windows 10 EoL news, I was able to move my dad over to Linux mint. But he does a lot of finance stuff. Long ago, Linux had a belief that desktop Linux are not the primary target for crackers but I don’t believe that true anymore since it’s getting significantly popular lately like Europe government migration over to Linux and Libreoffice.
My question would be , given my dad is just as careful on Linux as he has been on windows, would it be fine to do finance like banking and trading (not the fastest kind )?
If not, what would be your distro of choice for that? Even browsers (I installed Firefox and Edge from Microsoft website deb file)
Qubes OS gives him high security with relative ease.
Fedora Silverblue with auto update and Flatseal tightened apps is a nice middle ground.
RHEL minimises supply chain attack risk and provides features like kernel hot patching. He can use free developer subscriptions. Also try SUSE.
Security wise Chromium is a bit better than Firefox. Try to seal it up with SELinux. Red Hat only supports Firefox however.
SecureBlue can be used as a reference, but it’s still downstream so personally I’d avoid using it in case of supply chain attacks unless securing Silverblue is too much of a hassle.
Keep in mind that Flatpak sandbox interferes with browser sandboxes.